node-js

Chapter 13: Cluster Module
Syntax
• const cluster = require("cluster")
• cluster.fork()
• cluster.isMaster
• cluster.isWorker
• cluster.schedulingPolicy
• cluster.setupMaster(settings)
• cluster.settings
• cluster.worker // in worker
• cluster.workers // in master
Remarks
Note that cluster.fork() spawns a child process that begins executing the current script from the
beginning, in contrast to the fork() system call in C which clones the current process and
continues from the instruction after the system call in both parent and child process.
The Node.js Documentation has a more complete guide to clusters here
Examples
Hello World
This is your cluster.js:
const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
// Fork workers.
for (let i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('exit', (worker, code, signal) => {
console.log(`worker ${worker.process.pid} died`);
});
} else {
// Workers can share any TCP connection
// In this case it is an HTTP server
require('./server.js')();
}
This is your main server.js:
https://riptutorial.com/ 58